Coil winding machine



May 27, 1958 Filed NOV. 12, 1953 1.. M. MASON con WINDING MACHINE l2 Sheets-Sheet 1 by 1Z9 Wttorwey L. MASON 2,836,204

COIL WINDING MACHINE l2 Sheets-Sheet 2 May 27, 1958 Filed Nov. 12, 1953 I I m I M w v Mm 0% .r cm m 7 wvx e LIN w o A w 1% NR MN May 27, 1958 1.. M. MASON COIL WINDING MACHINE 12 Sheets-Sheet 3 Filed Nov. 12, 1953 Aawe/UZ Mason May 27, 1958 Filed Nov. 12, 1953 L. M. MASON COIL WINDING MACHINE '12 Sheets-Sheet 4 1.. M. MASON COIL WINDING MACHINE 'May 27, 1958 12 Sheets-Sheet 5 Filed Nov. 12, 1953 H/Js flttorney May 27, 1958 L. M. MASON COIL WINDING MACHINE l2 Sheets-Sheet 6 Filed Nov. 12, 1953 wmm KP @N IL 5 lilFllllzil v v8 f7? 1/6772: or A awev/ M was 0/? 77/3 Jitter/76y QNN Illll llllII-lllll mm NE May 27, 1958 L. MQMASON .COIL WINDING MACHINE l2 Sheets-Sheet 7 Filed Nov.

fin/enter 1.0 we///7 Mason 4% fills fitter/76y .3 1 .Id -m i r w 3 g a Q May 27, 1958 L. M. MASON con. WINDING MACHINE l2 Sheets-Sheet 8 Filed NOV. 12, 1953 [r2 Vent-o2" A 0we///7. mason H128 77ft or'riey y 5 L. M. MASON 2,836,204

COIL WINDING MACHINE Filed Nov. '12, 1953 12 Sheets-Sheet 1o May 27, 1958 1.. M. MASON con. WINDING MACHINE l2 Sheets-Sheet 11 Filed Nov. 12. 1953 fr; Mentor 0 We///7. mason 4y wb f/Ils flbtarney n 1 mmw 0 J aw y 1958 L. M. MASON 2,836,204

con. WINDING MACHINE 12 Sheets-Shet 12 Filed Nov. 12, 1953 I l fr; verv Cor- .40 we///7. Mason United States Patent CGIL WINDING MACHINE Lowell M. Mason, Fort Wayne, Ind., assignor to General Electric Company, a corporation of New York Application November 12, 1953, Serial No. 391,496

39 Claims. (Cl. 140--92.1)

This invention relates to coil winding machines, and more particularly to a novel machine for winding coils into the slots of electric motor stators.

Where stator coils have been wound by machine, it has been customary to have the machine wind the coils directly into the stator slots, that is, the coils are actually wound in the slots without any previous forming. Several undesirable factors have presented themselves in winding machines using this kind of operation. These stem mainly from the fact that the Winding cannot be an accurate operation since it would be highly impractical to use any kind of form in the slots themselves. One result of this inaccuracy is that a smaller number of turns can be introduced into each slot than would be the case if the coils were accurately placed to take up no more space than was necessary. A corollary to this objection is that most machines in use today produce cross overs on the wires, that is, the wires cross over each other and take up more room. Quite frequently this results in the coating of insulation being cracked or broken, particularly in the slots. Another objection to winding the coils directly in the slots is that an unnecessary amount of time is consumed, since each winding has to be put into each slot turn by turn. Yet another undesirable result of performing the winding operation directly in the slots is that high pressure points frequently occur between the wire and the corners of the slots, bringing about the likelihood of damaging the slot insulation.

To avoid these undesirable features it is necessary to eliminate the winding operation in the slots. To achieve precision, economization of space, and speed it is necessary to provide a machine which will prewind the coils and then place these prewound coils in the stator slots. Since these are two entirely separate operations, such a machine will be able to be in the process of winding another coil While an already wound coil is being inserted into the stator slots. Furthermore, the winding forms can be so made that all available space in the slots is used so that cross overs of wires are eliminated.

An object of this invention is, therefore, to provide a coil winding machine which will pre-wind the coils and then, in a separate operation, insert them into the stator slots.

A further object of this invention is to provide a coil winding machine which will eliminate the above named undesirable features through fast precise operation.

Further objects and advantages of this invention will become apparent and the invention will be better understood by reference to the following description and the accompanying drawings; and the features of novelty which characterize this invention will be pointed out with particularity in the claims annexed to and forming a part of this specificationJ This invention in its broadest aspects provides a coil winding machine which will pre-wind the coils and then place them in the field member slots. Means are provided for winding the coils around stationary forms, and other means strip the coils off the forms and place them ice in a member which then carries the coils to the field member and inserts them into the slots.

In the drawings,

Figure 1 is a top view of the improved coil winding machine of this invention;

Figure 2 is a side view of the coil winding machine;

Figure 2A is an end view of parts of the machine as viewed from the left end of Figure 2;

Figure 3 is an end View, partly cut away, of the machine;

Figure 4 is a section taken on line 4-4 of Figure 2;

Figure 5 is a section taken on line 5-5 of Figure 3;

Figure 6 is a section taken on line 66 of Figure 2;

Figure 7 is a section taken on line 7-7 of Figure 2;

Figure 7A is a section taken on line 7A7A of Figure 2;

Figure 8 is a section taken on line 8-8 of Figure 3;

Figure 9 is an enlarged side view of the coil guides in the improved machine;

Figure 10 is a view in perspective of the nose piece of the machine before a winding operation;

Figure 11 is a View in perspective of the nose piece of the machine during a winding operation;

Figure 12 is a view in perspective of the nose piece of the machine after a winding operation, with coil separating means in place;

Figure 13 is a view in perspective, partly cut away, after the coils have been placed in means to carry them to the stator;

' Figure 14 is a view in perspective of the conveying means after it has transported the coils to the stator and inserted them in the slots;

Figure 15 is a side view of the stator holding device with a stator therein and the conveying means Within the stator, preparatory to insertion of the coils;

Figure 16 is a section taken on line 16-16 of Figure 15;

Figure 17 is a side view, partly in cross-section, of the stator holding device with a stator therein and the conveying means within the stator, after insertion of the coils into the slots;

Figure 18 is a section on line 1818 of Figure 17;

Figure 19 is an exploded view in perspective of the coil conveying and inserting means;

Figure 20 is a stripped view in perspective of the improved coil winding machine;

Figure 20A is a section taken on line 20A20A of Figure 20;

Figure 21 is a view in perspective of the wire carriage of the machine including a latching mechanism provided to ensure perfect operation;

. Figure 22 is a top view of an element of the novel machine of this invention and of the operating connection to the element; and

Figure 23 is a section taken on line 2323 of Figure 1.

Referring now to Figures 1 and 2 of the drawings, the sequence of operation of the machine will be shown. All parts referred to in this first brief description will be more fully described subsequently. A pair of motors 1 and 2 rotate in opposite directions. By means of pulleys 3 and 25, belts 4 and 26, pulleys 5 and 24 and a clutch 6, pulley 82 and V belts 98 will be caused to rotate in one direction or the other. A pedal 9 will, when operated, actuate a linkage assembly lit to operate clutch 6. Coil wire 11 feeds from a spool (not shown) and passes over tensioning wheels 12 and is fed over wheel 13, under wheel 14 and through the housing 15 to carriage 1d. Carriage 16 is mounted on a guide 17 which rotates about coil form 172 which is stationary. Lead screws 159 and 160 rotate relative to guide 17 to cause carriage 16 to move longitudinally along guide 17. By this means carriage 16 carries the wire around coil form 172 to form the coils. When the coils have been formed, they are removed from form 172 by means to be'laterdescribed' and placed in injection lfead 2%. Injection head 24 moves at right angles to -the axis of coil form 172 and is operated by age'ar moto'r2'1 whose operation is timed by a switch 22 controlled by a pair of cams 23. By means of motor-I21, projection head move's'thecoils over to the "stator core and inserts the coils in the slots thereof.

Referringinow to Figure 20 of the drawings, electric 'motorl rotates in a clockwise direction while motor 2 rotates'ina counterclockwise direction. Both motors 1 and 2 operate continuously during use of the machine.

Motor 1 transmits its clockwise motion to a pulley 24 throughpulley 25 and belt 26. Motor 2 transmits its fcounterclockwise motion to pulleyS by means'of pulley 3 and belt 4.

' When it is desired thataicoiljwinding operation be performed the machine operator applies momentary pressure with'his foot to bar '28 of foot'pedal '9. 'Bar 28 is rigidly. connected by means of members 29.to spindle 30 'WhiCh'iS .pivotedin stationary brackets 31 to which is "attached foot rest. 32. Downward motion of bar 28 will cause rotation of spindle 30 thereby moving linkage member '33 of linkage "assembly '14 in aidownward direction. As member '33 descends it pullswith it linkage member 34; slidex35 is attached to member 34 and is, consequently, pulled down with it. Attached to slide 35 is a member 36 havingtwoslots 37 and 38. Pivoted "in each of slots 37 and 38 are hooked members 39 and 40. Hook 39 has a bar 41 rigidly secured thereto and'extending therefrom; Hook 4% has an equivalent bar42. Each of bars 41*and 42 extends over a shifter 'member .3. Depending upon the position of shifter 43 "it will engage either bar 41- or bar 42 and thereby preventone of the hooks 39 and 46 from. engaging a T arm 44. The mechanism for "selecting the position of V shifter 43 will be fully described hereafter.

by keyways 64 and 65 are elements 66 and 67 rotating i with shaft. 61. Element 66 has an annular brake surface 68 and element 67 has a corresponding brake surface 69. Elements 66 .and67 are biased together by a spring70 mounted on a rod 71 threadedinto element 66 as at 72. A brake member'73 'is provided having'surfaces 74 and 75 against which brake surfaces '68 and 69 are respectively adapted .to bear. IMember 73 is loosely, mounted in housing 54 so that although rotation of the member is I prevented it is free to slid'e'a'short distance toward either element 66 or element 67. The brake member 73 has its componentparts secured together and is fastened to housing 54 bymeans .of bolts 76. generally triangular :shape'in its'preferred embodiment.

When yoke 46 swings in one direction or the other bearing 48 will move with it. Assuming that hook 239 has engaged T arm 44 (Figure '20), the top partof the T 'arm will'swing to the 'right'and engage lug 49 which is secured to and extends from the clutch yoke 46. This will cause the top of'yoke 46' to be swung to the right' as viewed in Figure 5, "and-bearing 48 will slide to the right. Recesses 77 are providedjin elements 66 and 67 Referring now to Figures 6 and 20, T arm 44 pivots about hub 392 of yoke-46. 'Thus, if it be assumed that ihook4i is maintained out ofengagement by shifter 43, hook 39 will'engage in recess 372 of T arm 44 to pivot 'T: arm 44abouthub 392. -A pair Ofjlllgs 49 and Share secured to'yoke 46 of clutch-6, and 'a's mall spring 51 is mounted in'a recess 52 in T arm 44. Spring 51 applies pressure to apair of small protruding "elements (not shownl-which extend 'one'ffrom each side ofT 'arm 44- opposite 'lu'gs 4'9-and 59.. Spring'51 and the smallprotrudingelements are provided totake up lost motion -of T arm -44 when it is pivoted -against one of lugs 49 and 50. Thus, the amount of'motion 'of' T arm 44 is prevented from being critical, since lugs 49 and 56 will not be forced beyond their proper positions even if T "arm 44 movesja somewhat'excessive amount. It will .now be seenthat engagement'of. one of hooks 39 and 49 will cause pivoting of T arm -44-.about hub 392 of yoke 46and that Tarm 44 will therefore apply pressure against one of lugs 49 and 50. Whenthis occurs yoke 46 in'housing 54. 9

Referring now to Figures 5 and 6, clutch 6 is mounted to the bottom of table 55 by bolts56and'bracket 57. Bra'cket 57in turn is secured to housing 54 by any de will be caused to swing about pin 53 which is secured l in which the inner race .78'of bearing 48 rests. When bearing 48'slides to the right itwill engage element 67 a and push it to the right thereby disengaging brake surface 69 from surface'75 'of member 73. It will also cause clutch'surface179'of element '67 to engage clutch sur'face SOof pulley.24. Pulley 24 is mounted on-shaft 61 by means of bearing 81','and the only connection be tween pulley 24 and shaft 61'must come through element 6'7. Because. of spring element 66will tend to follow. in the same direction as element 67. However, it will very .soon abut againstshoulder '63 on enlarged ,portion '62 of shaft 61 and-be prevented thereby from further motion to the right. Since it is necessary'for both elements 66 and67 to have their braking surfaces '68and 69 bearing against member 73 in order to obtain effective braking action there Willbe no effective braking action so long as hearing 48 .is holding element 67 in engagement with pulley'24.

The clutch 6 will thereby transmitthe motion of pulley 24 through shaft 61 to pulley.82 thereby causingit to rotate in a clockwise direction. As soon as a coil is fully wound the yoke 46 is returned to its upright position, as will be explained below, and spring 70'is thereby free to clamp elements 66. and. 67 against member 73 to brake the shaft 61 and stop operation through the clutch6. If lug 50'instead ofl lug 49 had been engaged by T ,arm44, yo'ke 46 would'have been swung .to

the left as viewed inFigure '5 and precisely the same sequence 'of operation would have occurred to engage element "66 with pu'lley 5 to cause pulley 82 to be resired means such as welding, as shownat 425 in Figure 5.

In Hi5 P nt structure another member 42-6 has been secured, as by welding, to the bottom of'ho using 54. While a single integral piece may be used it is preferred that side supporting elements '58 be mounted to'member 426 by means of screws 59. A bearing :48 is mounted in yoke 46 by means of a 'pairof pins 45,.firmly secured -to;yoke 46' as at 393. Slot .66, provided for pin 45in sleeve r47 ofbearing 48, is'somewhat larger, in a rated in *a counterclockwise direction. I

Returning now to. Figure'20 it willbenoted that at and by co-operating with protrusion 83 on T arm 44 prevents the T arin from returning toits, normal position.

'This is necessarybecause of Ithefact that pressure by the operatoron rod228is applied for only a very brief time and that upon release 'ofipressure by the operatorthe 1 .arm .44 will tend toreturn to-its normal' position as. shown. Member 84 is used to prevent the T arm fromso returning until .the completion. ofa winding operation.v

v Member 84 .is'pivotedto .linkf86 which in turn is rigidly fastened .to a bar; 87 which also'carries .Qa member88 7' :having a roller .89. Roller 8 9is adapted to be engaged by a carn90, whoseoperation will be egplained below.

Member 73has a assasoa Movement of member 84 into a position where it prevents T arm 44 from returning to its normal position is governed by rotation of cam 90 (see also Figure 4). I The rotation of spindle 91 on which cam 90 is mounted also controls the position of member 92 which is pivotally mounted at 93 on shifter 43, and which is movable within a bushing 422 as shown in Figure 6. It is by this means, which will also be explained in greater detail below, that shifter 43 selects which of books 39 and 40 will be prevented from engaging T arm 44. When member 92 is pushed downwardly, shifter 43 is pivoted about pin 394 (see Figures 2 and 6) in a counterclockwise direction to abut bar 41 and maintain hook 39 out of engagement with T arm 44; it will be noted that pin 394 may be formed as a screw arranged to hold a bushing 423 in place so that the member 43 is freely movable therearound; when member 92 is not being forced downward the position of shifter 43 is such that it prevents hook 40 from cooperating with T arm 44.

Referring now to Figures 4 and 20, the operation of counter 94 will be described. Counter 94 is provided for two main purposes. One is to stop the mechanism at the end of the winding operation in a precise fashion, and the other is to cause clutch 6 to reverse its operation the next time the machine is started by pressure on rod 28 of foot pedal 9, thereby reversing the coil winding operation. Worm gear 95 on spindle 91 meshes with a gear 96 to provide one rotation of worm gear 95 for a predetermined number of rotations of gear 96, such as 25. Gear 96 may be formed integrally with pulley 97 which is rotated by V belts 98. These belts in turn are moved by pulley 82 which is fastened to clutch shaft 61 by means of k'eyway 99. Thus, spindle 91 will be rotated once for each 25 turns of coil winding. Spindle 91 is supported towards its right end by a stationary bushing 373 maintained in a ring 190 which is firmly secured in opening 101 of housing 162. At the left end of spindle 91 there is a member 103 secured to housing 102 by screws 104 and having an internally threaded surface 195, there being threads to the inch in the embodiment shown. Spindle 91 is correspondingly threaded, as at 166, so that rotation of spindle 91 will also cause axial movement in one direction or the other depending upon the direction of rotation of spindle 91. The other end of spindle 91 is threaded, as at 107 and mounted on threaded ends 167 of spindle 91 are cams 108 and 109. Since these cams are to remain in fixed relation to each other they may be made integrally, as in the present embodiment.

It has been shown that spindle 91 moves axially as it rotates. Because of this fact cams 188 and 169 will not be in contact with their cam followers 89 and 92 until axial movement brings them over the cam followers. When cam 108 contacts its follower 89 it will cause member 84 to be lifted to an inoperative position. When cam 189 contacts its follower 92 it will cause shifter 43 to be moved to a position where it prevents hook 39 from ctr-operating with T arm 44, and permits hook 40 to do so. Since a lifting of member 84 to an inoperative position will permit T arm 44 to return to its normal position and, consequently, brake clutch 6, the moment when cam 168 hits follower 89 determines the end of the coil winding operation in one direction. It Will be seen from Figure 4 that cam 108 determines the number of coil turns in a counterclockwise direction while cam 90 determines the number of coil turns in a clockwise direction. The number of coil turns is determined by the distance between cams 198 and 90. Cam 108 is adjusted on threads 107 by means of nut 110, and a lock nut 111 is then used to lock the cam in place. The cam may be precisely located by means of graduated surfaces of parts 112 and 113. Part 112 is integral with nut 110 and earns 103 and 109; it has one reference mark as compared to 25 reference marks on the graduated surface of part 113. Part 113 is keyed to spindle 91 at 374 so as to slide thereon. Since spindle 91, through Worth 95, rotates once for each 25 turns of coil, it will be seen that part 113, because of the 25 to 1 ratio of reference marks, permits the cams to be placed so accurately that the number of turns to be wound can be determined within one. This is achieved by turning part 112 relative to part 113 to the desired point, and then locking the parts in that position with lock nut 111. In view of the adjustability of cam 108 it is generally unnecessary to make any adjustments of cam 90, since it is the distance between the two cams surfaces that determines the number of turns that will be wound. However, for minor adjustments, up to one revolution, that may be desired for stopping the clockwise winding operation (as viewed from Figure 4) a slot 114 is provided in spindle 91. Through this slot extends a pin 115 which is secured at its outer end to cam 90 and at its inner end to an inner spindle 116 which may be rotated a small distance within spindle 91. Nut 117 is secured to inner spindle 116 and is turned to secure an adjustment of the position of cam 90. Member 375, keyed at 376 to spindle 91, acts as a reference member in the same manner as part 113. When such an adjustment has been effected nut 117 is locked in place by means of lock nut 118.

It will now be seen that an accurate counting device has been described which will determine precisely the number of turns of coil by means of an adjustment of the distance between cams 90 and 108, and which by means of cam 109 will determine whether the subsequent operation is to be in a clockwise or counterclockwise direction. Referring to this latter operation it will clearly be seen that at the end of a clockwise operation spindle 91 will have moved to the left so that cam 109 is pressing down on member 92. This in turn is pivoting shifter 43 to maintain book 39 out of engagement with T arm 44. Thus when the next operation is commenced hook 40 will engage with T arm 44; as soon as there has been a slight motion of spindle 91 in the counterclockwise direction cam 109 will cease to engage member 92 and shifter 43 will return to its normal position. However, by this time hook 40 has already engaged T arm 44 so that T arm 44 is no longer in a position where it can co-operate with hook 39. T arm 44 will continue to be held in this manner because of member 84 which has descended to maintain the T arm in an ofi-center position. When the next operation is started the shifter 43 will be in its ordinary position preventing book 40 from engagement with T arm 44. Since T arm 44 will have returned to its normal position because of the action of cam 90 pulling member 84 upward, hook 39 will be able to engage with the T arm 44 and the operation will consequently be in a counterclockwise direction.

Figure 4 shows the presence of prongs 119 on slide 35. These prongs are desirable to steady slide 35, since it forms the end of a relatively long straight member with link 34. This is effective by having prongs 119 slide intorecesses 120 of clutch housing 54 thereby to provide a steadying influence on slide 35. A tie bolt 121 connects prongs 119 of slide 35 together. Tie bolt 121 slides up and down in groove 122 in housing 54 thus in effect providing a safety limit on the amount of movement of slide 35.

Referring now to Figure 7 of the drawings, it will be seen that pulley 97 actuated by the V belts 98 is mounted on a core 123 by means of a bearing 124. Pulley 97 is secured to a drum 125 which, in the present embodiment, has been made integral with the pulley. Drum 125 rotates between the stationary core 123 and a housing 126. Drum 125 is supported at its left end by bearing 127 secured to housing 126, and at its right end by hearing 128 secured to core 123. A centrally located bearing 129 provides additional rotatable support with respect to housing 126. It will be seen that rotatable 7 drum .is held between the stationary housing "126 and the stationary core 123.' I

Referring to Figure 20A of the drawings, there is shown a preferred means of maintaining the .core .123 stationary within the rotating drum 125.. A ring gear 130 .is .nonrotatably securedto housing 126,. by means of bolts 131. A gear 132 .issecured to core 123 .by means off a key 133/11 gear 134 is rotatably secured to the gear 134, and gear :139 meshes with gear .132. Gears 132, .1-38 and '139' are so proportioned with respect .to mtg gear 130 andlgeari132rthat gear 132 is locked to a the same rotational speed as gear 130. Since ring gear 1301is maintainedfistationary,.gear 132 and consequently core 123 -.will :alsobe maintained stationarv' J Returning .to Figure 7, a,carriage, indicated generally at 16,.is-secured to and rotates with .drum "125, and is mounted on'a guide assembly '17. The back 143 of guideassembly 17 is removed .a few thousandths of an inch .from the front 144 of housing .126. in order to prevent rubbing. The wire which is to form the coils is'lled under wheel guide14, rotatable about pin 145 and secured todrum 125 .by extension '146. The wire then passes through tube 147, over groove 148 insshoe 149, over wheel 150 rotating about pin 151 and secured to carriage 16, and then through bushing 153. Carriage 16 is :carried .on a guide tube 154 which ispart of guide assembly 17 and consequently, rotates with drum Referring againto Figure 20, it will be seen that a gear 155isimmovably secured to core 123. Guide tube 154 and the other parts .of the guide assembly 17 are secured together at their outer ends by plate 157. I Secured to this plate are stifiening rods 158 provided to add rigidity to the assembly,-and lead screws 159 and 160 which will be further discussed below. Secured to guide tube 154 by means of a small housing .161 and a small shaft 162 rotatably mounted 1 in housing 161 is agear 163-securely fastened to shaft 162 andmeshing with-stationary gear-155. Gear 163, through shaft 162, turns -gear164 which in turn meshes with a gear'165 secured to lead screw 160. Gear 165 in turn meshes with gear 166 secured to the other lead screw 159.

, Thus, as the guide assembly 17 rotates with the drum around core'123 gear 163 meshes with gear 155't0 turn lead screws 159 and 160.

' Referring now to Figuresi'l, 11, 13 and 21 of the drawings, it will be seen thata tube like member 167 is provided on carriage 16. Member 167-isadapted to slide on guide tube 154. Eirtending downwardly from member 167 toward lead'screws 159 and 166 are members 168 and 169 Thesemembers 168 and 169 have halfnuts 377 and 378 respectivelyformed in their ends. Halfnut 377 is adapted lto'engage screw 159 when carriage 16 is turned one Way on tube 15.4.by wire tension, and, halfnut 378 will engage sciewlfii) when the wire tension .is in the opposite direction; '.Consequently, as gears 165 and 1661causeguide screws, 159 and 160 to rotate, one of them will be engagedby one of the halfnuts 160,is engaged bya halfnutpthe threading is such as to cause carriage 1610 movetoward drum 125.

explainedherebelow; Carriage 16 isjshown in pmition" ready to begin a winding operation when rotationv of guide assembly'17 is started. Lead screws 159 and 1.60

will Estart turning about their own axes because of f gears '165 and "166; thus, as the guide assembly 17 rotates with drum 125, carriage -16 willslowly move along one of lead screws .159 and 160 as the wire'is wound on the .wire forms, indicated generally at 172. It will be seen in Figure 21 that a, flat hook member 379 is secured to an extension 380 of plate 157. Hook379 is pivoted at 381; it is susceptible of being pivoted upwardly but .is

a biased to the position shown by a spring. (not shown).

A latch member 382, adapted to ,co-operate with book 379,,is firmly secured to member 167 as shown at 383. When carriage 16 is caused to slide 'along tube 154 toward plate 157, as will be hereinafter explained, .latch 382 will force hook 379 upward, and the two will ,then look together. 11Because of this locking action, carriage 16 will be unable to slide alongtube 154, when awinding operation ,is commenced, unless it turns to oneside or the other to free latch 382 from hook 379. When Referringnow to Figures 3, 8; 9, 10 and 20, it will be seen that since the coils of Wire formed each time-are ,eventually to be wound in six stator slots forming a stator pole, with-7each coil passing thru two slots, .coil torm--172 has three different parts 173, 1'74 and 175 to take care of the three difierent coil lengths whichwill be necessary. ;It will be understood that the number of difierent parts,such as 173, 174 and 17.5,may be varied depending upon the particular application of the improved coil winding machine of this invention, and:that the present number has been ,arbitrarilyselected for the levels 17;6, 177 andl'Ti (Figure 10).

Referring; now to Figures -;l0-and 21 of thedrawings,

171 maybe secured in: any desired :iuannerto anysta- .tionary .partof the .machinepfor? instance, as; shown in Figure ',Tit,ma y be, arranged-to extend from ;a;stationary half fins gn emhc whose un tion-will. e further present embodiment. It will be seenthat the sides-0f the form 172 are progressively wider and that thetops of the form are progressively higher, part 173.having merely a flat surface 176 around which the coils must go, -part 174 having raised walls 177 over which the coils must go, and part 175 having still higher walls 178.f0r the coils.

Parts 180,181 and l82 are provided with parts 175, 174 and 173 respectively and have sections 388, 389 and 390 respeetivelywhich fit within a slot 179 .(Figure :10) 7 provided substantiallythroughout the length of form 172,

as shown. It will be clear that form 172 may, foreconomy slot-179, as1shown in' Figure 10 forinstancea In.-any.

event, when assembly'iscomplete, form 172 is in essence a unitary member having a slot which extends entirely .thereacross and for substantially the entire length thereof but which terminates short of the outer end thereof.

Referring now specificallyto Figure 3 it will be seenthat I side parts 180, 181 and 182 (which in Figures 10, .11, 12

and 13 are sectioned off as shown to permit better understanding of these figures) are not of .equalsize but, to

the contrary, increase in width with the height of the All three parts .189, 18 1and ;18 2have.these varying dimensions for no more, however, than 180 vdegrees of a circle on each side of form 172- (see Figure 3). This is so in order to.en-,

ablerelatively thin sections 388, 339 and39t) (Figures 7 and :10), whic-hare integral respectively with parts 180, 18 1 and 18 2, to fit within. slot 179. These sections extend into slot 1fi;9 for a short distance only for reasons to be hereafter explained. Byfitting withih-slot"179," sec- 110115 383,.339fi1'1'd39 serve to align parts 130, 181'and 152, and ;to;maint ain them in theirgpropersoperative positions. ;S cr ewf;386 'whichis threaded through :sections 338 and 389, and secured to part 182, also helps maintain the parts in proper alignment.

The precise shape of parts 180, 181 and 182, to be further discussed below, of the coil form 172 appears most clearly in Figures 3 and 7. If parts 180, 181 and 182 of coil form 172 had evenly curved surfaces there would be undesirable bunching of the coils when they were later removed from the form 172. For this reason the curved side parts 180, 181 and 182 of form 172 have been given a hilland valley contour as shown at 384 (Figure 7). A single turn of wire will fit in each of the grooves 385; thus, when the coils are removed from form 172 there will be no bunching of the wires since the wires will have several different levels at which they will be placed. This will conserve space when they are finally placed in the stator slots, and will prevent undue crowding of the wires during the operation of removing them from form 172 and transporting them to the stator core, as will later be explained.

It will be understood that form 172 may be secured to core member 123 by any preferred means. In the present embodiment of the invention, however, the securement has been effected by providing the form 172 with a pair of flanges 431, one of which may be seen in dotted outline in Figure 7. Each flange fits over a side of projecting portion 427 of core 123. When the form and core are so positioned, a pair of bolts 428 and a pair of dowel pins 429 are inserted, as shown in Figure 7, through the projecting portion 427 and the flanges 431 so as to secure form 172 and core 123 together.

A comparison of Figures and 11 will show the starting point of carriage 16 for the winding operation, its subsequent motion around coil form 172, and the consequent way in which the coils are wound. The number of turns per coil may easily be adjusted by means of screws 386 which appear in Figures 7 and 7A. A recess 387 is provided in each of the two parts 180 of form 172: By turning a screw 386 of which there are two, one being secured to each of parts 182 (Figure 7A), and holding part 181 stationary, part 181 can be caused to enter recess 387 thereby shortening the effective length of part 181 and increasing the efiective length of part 182.

This efiect is achieved by having thin section 389 of part 181 threadedly mounted on screw 336. Thin section 388 of part 188 is also threadedly mounted on screw 386'. Therefore, by holding part 180 stationary while screw 386' is turned, the effective length of part 181 may be changed at the same time that the effective length of the sum of the three parts 180, 181 and 182 is being changed. In the present embodiment provision is made in form 172 for a total of 120 turns of wire. By means of adjusting screw 385 this number may be diminished, and the division between parts 188, 181 and 182 may be changed as desired. A recess 432 (Figure 7A) similar to recess 387 in part 189 is provided in part 181. In the same manner that part 181 could be made to enter recess 387 part 182 may be made to enter recess 432. It will be seen that this affords a further means of adjusting the number of coil turns to be wound.

Gnce coils have been wound, it is necessary to provide positive means of keeping the 3 different sizes separate and apart from each other when they are removed from form 1722. Figures 8 and 9 best illustrate the means employed to achieve this separation. Referring now to Figure 8, there is shown a cross section through core 123. Mounted within core 123 in sliding relationship thereto are six plate-like divider members 183, 184 and 185. Each two sets of plates bearing the same number pass over opposite sides of a single size of formed coil. Thus plates 183, when they are slid forward, as will hereafter be explained, pass over the coil around part 173 of form 172, between walls 177 and 178. Plates 184 pass over the coil wound on part 174, between walls 178, and plates 185 pass over the coil wound on part plates 183, 184 and 135 have I6 175 above the level of walls 178. r The plates are parallel to the surface 176, and to the surfaces formed by the planes between walls 177 178 respectively, and are separated from each other only by the width of the wire forming the coil. This appears clearly in Figure 9 where been moved to their most forward position over form 172. It will be seen that the coils on part 173 are firmly maintained in position by plates 183 and thatthe same is true of the other two groups. Surface 176 and walls 177 and 178 are preferably formed so that there is a very small angle, on the order of one degree, between them and the longitudinal axis of form 172. This angle is so provided that the two fiat surfaces 176 of the form 172 are closer together at the outer end of the form 172 than at the inner end thereof. The taper provided for the walls 177 and 178 is s milar; this effect is best seen in Figure 9 where it will be observed that the different surfaces of form 172 taper toward each other as the right edge of the figure is appreached, in contradistinction to the slots 231 of injection head 28 (which will be further described below) which are formed substantially parallel to each other and to the longitudinal axis of form 1'72. Divider plates 183, 18 i, and 185 are also formed with a slight taper, that is, there is an angle of approximately one degree between the axis of each divider plate and the longitudinal axis of form 172. Thus, the divider plates are parallel to the surfaces of form 172 with which they cooperate. By providing the divider plates with a slight taper, and by forming surface 176 and walls 177 and 178 so as to cooperate therewith, it will be seen that when the divider plates slide forward, each one within a coil section, they will tend to stress the coils slightly by expanding them prior to their removal from form 172.

Returning now to Figure 8 it will be seen that a pin 186 passes through an opening 187 near the hack of plates 183, 184 and 185. Pin 186 is actuated by a sleeve 188 which extends to the left through sleeve 354 to bearing 488 and collar 353 (see Figure 23), and is operated in a fashion which will later be explained. As pin 186- is moved forward by sleeve 188 it carries with it plates. 183, 184- and 185. When pin 186 reaches its forward most position, plates 183, 184 and 185 are in the positiom shown in Figure 9.

Referring to Figure 12, the position of plates 185', 184 and 183 after full forward movement of pin 186. will be seen. The plates slide into divider plate locaters 190. These are provided to add rigidity to the divider plates 183, 184 and 185 and to minimize the cantilever beam effect which results from the plates being supported only at their back end. Plate locaters 198 are secured to a yoke 191 through which slides an iniection head 28 which will be fully described below. Referring to Figure 9 again, the plate locaters 198, secured to yoke 181 by means of screws 182, will again clearly be seen.

Once divider plates 183, 184 and 135 are properly in place the next step is to slide the coils off form 172. This is effected, as shown in Figure 8, by means of pusher blades 193, 194 and 195. These blades tit in between plates 183, 184 and 185; each one has a long slot 198 provided therein to permit divider plate pin 186 to move all the way forward before any motion is given to the pusher blades 193, 194 and 1%. The blades are secured together as at 197 by rivets 198 and are kept at the proper distance from each other at this point by spacer blocks 198. A pusher blade pin 288 is secured to a sleeve 201 which slides within sleeve 188 to move pin 288 back and forth. Since pin 186 will already have been moved forward to put plates 183, 184 and into their operative positions, when sleeve 281 actuates pin 280 to move it forward with the pusher blades 183, 194 and it will be able to do so freely without receiving interference from pin 186.

The shape of the pusher blades will be best understood by reference to Figure 22, in which a single pusher. blade.

195 is shown. It will "be seen that slot 196 extends almost the entire length of pusher .blade 195 to accommodate the sliding of divider plate pin 186. I

It will be seen from Figure '7 that the hill and valley eflect as shown at 384 in forth 172 would make it imtion as previously described. Referring to Figures 7,

7A and 8, the retraction of the parts will 'now'be described. As sleeve 18% is moved forward,'carrying pin 186 to put the divider plates 133, 184 and 185 into ope'o' ative position, the front 202 of sleeve 138 comes into contact with the back 293 of a block 2194, which is ar- 7 j ranged to slide back and forth within slot 179, thereby causing block 204 to move forward. The travel of block 284 is limited by a pin 205 fastened. toothe main part of form 172 and sliding in a slot 206 in block 2514. Springs 207 are anchored in parts 288 of core 123 and press movable parts 210 inwardly against block 2ti4. When block 204 is moved forward by part 262 of sleeve 18$ cam surface 269 permits springs" 287 to force movable parts 21% inwardly. V

1 Referring now to Figure 7A, it will beseen that the stationary outer part of the form 172 supports a pair of pins 411 and that a mousetrap type spring 412 is mounted on each of these pins. spring 4-12 is seated in a recess 414 in part 172, while the other end 415 of the spring fits into a slot 416 in part 132.

Block 2&4- is supported as its outer end 433 within an opening 417 in form172; "The block 204 is provided with surfaces 418 corresponding to surfaceslll at the other end which are respectively adapted to engage in wardly projecting portions 4-19 respectively formed on parts 182; The block 2% is also provided with cam surfaces 42 corresponding to cam surfaces 239 at the other end. Asthe block moves. to the right, as explained in connection with Figure 7, cam surfaces 4129 will cngage with surfaces 42?; respectively formed on parts 182,

and the springs 412 will forceparts 132 inwardly as end 415 of each spring slides in a slot 416. When the block 294 is withdrawn toward the left, the engagement of cam- One end 413 of each ming surfaces 425} and 421 will force each part 152 out 7 wardly against the action of spring K111.

It will now be seen that the block 204 ordinarily maintains the component parts 130, 181 and 182, in coil receiving position bypreventing springs 2%7 from moving part 216 inwardly and'by preventingsprings' 412 from rooving the form parts 132 inwardly; Parts 21*? are respectively attached to screws 356'bymeans of pins 395 which fit through extensions 212 of screws 33-6, and all three pairs of component parts 18%), 131 and 152 are respectively secured to screws 3% as described above.

' 7 Thus, when block 204- slides forward to the right, springs 207 are free to move parts 219 inwardly and springs412 12 structure is present also in part 390, asshown in Fig; 7A. 7 V 1 Returning'to Figures 8 and 13K in the latter of which the pusher blades are fully forward), it will now be seen that, when pusher blades 1-93, 194 and 195 are moved forward between divider plates 1'83, 184 and 185 by pin 209; they will encounter'no obstruction fromthe hill and valley structure as shown at 384 in Figure 7. Thus, blades 193, 19.4 and 195 will push the coils otf form 172 as they move forward; l I

fPin 209 (Figure 8) has its ends terminating in' square cross sections 215. As the pin starts to slide forward to move the pusher blades, and strip wire 051mm 172, ends 215 will'slide in recesses 216 of rods 217. sacured to the fronts of these 'zrods by. screws 218 is a traverse reset ring 219 whose function" will be ex- Plained later. After pin 20!) has moved pusher blades 193, 194 and 195 forward a certain distance the ends 215 of pin 200 will contact the ends 229 of recesses 216 in rods 217. Pin 200 will then, while continuing to carry pusher blades 193, 194and .195 forward, also carry tray.-

rs resetriug 21,9 forward. The total forwardmotion of traverse reset ring 219 will, of course, be less thanthat of pusher blades 193, 194. and 195 because .ofithe lost 7 Oll aClI Q d'bY the recesses 216 in rods 217.

Figure 13 shows that divider plates 183, 184 and 185 have been moved forward by pin 186. Ends 215 of pin 290 have moved traverse-reset ring 219 into the posi- It will now be seen why recesses,216 in tion shown, rods 217 are necessary. Since pusher blades 193, 194 and 195 must forcethe coils into injcction head 29 they must of necessity move a greater distance than traverse reset ring 219, whose function (explained below) is accomplished when it moves the carriage 16 to the end of guide a sSimbly 17. V

It will be seen that pivoted on member 167 of carria ge 16 011 a pin 221, there is a small lever 222. Referring momentarily to Figure 10 it will be 'seen. that lever 2 22 ;ha;s an essentially U-shaped cross section. When traverse ring 219 moves forward it hits the bottom 223 of lever 222. This ,causes'the lever to pivot aboutpin 221 until its top sections 22 5 abut against stiffening rods 1,58,; A stop 43D engageable with the bottom 223 is normally provided to take the'greater part of the pressure off sections 224, therebypreventing them from s raping ong rods 15s.

As'has been previously explained, members 163 and 169 projecting from members 16'7 (Figure ll) terminate in half nuts 377and 378 which are adapted to mesh In the of drum 125 carrying guide assembly 17 is to be clockare free to. move parts 182 inwardl therefore, the com- I ponent parts 18%, 131 and 132 will all be moved irrand removed'from the coils which were wound on them.

It has been described beforehow' parts 154 181 and 182 all fit within slot 179 as at 338, 339 and 3%. Howover, these component parts do not extend solidly through slot 179; instead, they only extend into slot 179 a short distance, as shown at 213 for part 18% and at 214 for part 181. Numerals 213 and 214 actually represent the shape of parts 388 and 339 within slot 179 011 each side 7 block 264 is moved forward by sleeve 188. The same wise or counterclockwise. Since lever 222 is U-shaped, and pressure by traverse ring 219 at 223. on. lever 222 will cause the lever to bear with equal pressure upon both stiffening rods 158 with the top parts of lever 224 and upon both sides of the stop 430 with the bottom member 167 without any interference from the threads' on the half nuts 377 and 375. Bythis means, the foroperation. a

It is the;

It will be .seen in Figure 13 that pusher blades 193, 194 and 195 will have forced the formed coils completely off the coil form 172. Thus the elements of the coil forming apparatus are ready to be retracted to a position where a winding operation may be recommenced, carriage 16 already having been put in such a position by traverse ring 219 pressing on the bottom 223 of lever 222.

Referring now to Figure 7 it will be seen that slots 391 are provided in sleeve 188 in order to provide space for pin 208, and prevent interference therefrom when sleeve 188 slides forward with pin 186 to move the divider plates 183, 184 and 185 forward. Subsequently, sleeve 291 is moved forward carrying pin 2% to move pusher blades 193, 194 and 195 forward. Upon retraction of sleeve 281, as will be further described below, pin 2138 will be moved backward, carrying with it pusher blades 193, 194 and 195 and traverse rods 217. with traverse reset ring 219. Thus the pusher blades are returned to their position in core 123 and the traverse reset ring 219 is returned to its position at the front of core 123. Sleeve 188 will then be retracted, as will be further explained, pin 186 will be carried back, and divider plates 183, 184 and 185 will also be returned to their positions in core 123.

Referring now to Figures 8 and 7 it will be seen that within sleeve 261 there is a rod 226 having a, shoulder at 227 beyond which its diameter is enlarged as at 228. Rod 226 extends forward and is secured to block 204 as at 229. This may be efiected by having part 229 of block 204 enlarged and having rod 226 thereaded into it as at 231 When divider plate pin 186 has been moved back by sleeve 188 suficiently to abut shoulder 227 of rod 226 it will carry rod 226 back with it as it continues to move. This will cause rod 226 to pull block 284 backward, and cam surfaces 289 will then force parts 210 outwardly against the action of springs 287. Parts 218 are pinned to screws 386 which are connected to the elements 188, 181 and 182 of form 172 and consequently will carry them outward to their proper positions for the next coil winding operation.

Thus all elements, the carriage, divider plates, pusher blades, and reset rings, are now ready to start the next coil winding operation.

Referring now to Figures 9 and 19, it will be seen that injection plug 20 has therein slots 231 in exact alignment with slots 232 which are formed between divider plates 183, 184 and 185. Thus, when pusher blades 193, 194 and 195 are forced along slots 232, as previously explained, and as shown in Figure 13, the formed coils 233 will be forced along slots 232 and into slots 231 in injection head 21), which is at that tirne in the position shown in Figure 9.

Referring now to Figure 19, the construction of the injection assembly will be described. it will be seen that the shell 234 of injection head 28 is considerably wider than the main body portion 235 in which slots 231 are formed. Spaces 236 and 237 are provided on each side of main body portion 235 to accommodate pusher shoes 238 and 239. Pusher shoes 238 and 239 are maintained together within injection head 20 by a pin 24! which fits in opening 241 in pusher shoe 238 and opening 242 in pusher shoe 239. Pin 24% also passes through a slot 243 provided in body 235 of injection head 2t). Thus, the pusher shoes 238 and 239 are held together to move as a unit and are free to slide in injection head 20 to the extent permitted by the length of slot 243. Pin 240 has recesses 244 and pusher shoes 238 and 239 have corresponding openings 245. Screws 246 (Figures 16 and 17) pass through these openings to secure pin 24%) and pusher shoes 238 and 239 together. Since the two pusher shoes are free to slide with pin 24% in injection head 28, to the extent permitted by slot 243, the injection of coils 233 into injection head 20 will force the shoes 238 and 239 to the back of the injection head 28.

The injection head has its ends closed by a pair of caps 247 and 248. Looking now at cap 247, in Figure 19, it will be seen that it is fastened to injection head 29 by means of screws 290. A flange 249 closes the opening in the back of injection head 20; in flange 249 is an opening 256 whose purpose will be explained below. Accurate fastening of cap 247 to injection head 2%} is aided by rabbet 251 in cover 234 of injection head 28' At 252 there is represented a slot whose particular configuration and purpose will be described below. The details of cap 248 are the same as those of cap 247.

Pusher shoe 238 has a raised portion 253 which is topped by a surface 254, which preferably is sloping as shown. That part of the coil which will eventually form an end turn lies in front of raised portion 253 when pusher blades 193, 194 and 195 force the wire from form 172 into injection head 20 (Figure 13). Blades 255 of pusher shoes 238 and 239 are positioned so as to enter slots 231 in body 235, and to slide therein when the pusher shoe slides forward. Blades 255 project about a quarter of an inch into the sides of slots 231 in the present embodiment. Pusher shoe 239 has the same features as have just been described with respect to pusher shoe 238, the construction of course being exactly opposite so that the two shoes will have the same relation to body 235 when each of them is on an opposite side thereof. Cap 247 is secured by screws 256 to a flange 257 of a rod 258. Rod 258 is adapted to move back and forth axially as will hereafter be described and, hence, the entire injection assembly 29 which is secured to rod 258. through cap 247 and flange 257 will have the same motion as rod 258. A housing 259 (see also Figure 1) is provided in which rod 258 slides. A large ring 260 is secured to housing 259 and has projecting therefrom two large pins 261. These pins are adapted to fit relatively loosely in openings 262 in yoke 191, thereby maintaining yoke 191 essentially stationary but without preventing a small amount of play which is necessary for divider plates 183, 184 and 185 to conveniently slide into divider plate locaters 1919.

Referring now particularly to Figure 20, and to Figures l and 2, the means provided for moving injection head 20 containing the formed coils to a position where they may be inserted in the stator will now be described. A gear motor 21 is controlled by a switch assembly 22, gear motor 21 being so constructed as to cause a shaft 265 to rotate relatively slowly, at approximately one revolution per second in the present embodiment. It is only necessary to close a switch 264 momentarily in order to cause the motor 21 to operate, and motor 21 will continue to operate as controlled by switch assembly 22. Assembly 22 has a. cam follower member 267 riding on a cam assembly 23 mounted on shaft 265 and having two diametrically opposed rises 269 so that follower 267 is depressed twice each revolution of shaft 265. When follower 267 is depressed, switch assembly 22 will then stop operation of motor 21. The construction of motor 21 and of switch assembly 22 may be that of any of several well known kinds and is not discussed further herein. Thus, shaft 265 will rotate half a revolution each time before it is stopped.

A pair of cams 270 and 271 are secured to shaft 265; as the shaft turns one half a revolution the two cams 270 and 271 will turn with it. Rotation of cam 271 will cause a follower (not shown) and a rack 272 attached to the follower to move to the right, as viewed in Figure 20. The force causing this motion will be discussed here below. Gear teeth 273 of rack 272 will then mesh with gear 274 causing gear 274 to rotate counterclockwise. This gear is secured by a shaft 275 to a larger gear 276 which rotates with gear 274. Rod 258 carrying the injection head 20 has gear teeth 277 cut therein meshing with gear 276. Since it has been shown that gear 274 will rotate counterclockwise when rack 272 moves to the right due to the configuration of cam 271, gear 276 will also rotate counterclockwise. This will-cause rod cured to base 291a. X 7

within guide block 292' and rack 287 is similarly mounted r 7 258 to be moved to the carrying with it injection head-2Q. This motion is clearly illustrated in Figure 14; The gear diameters aresuch that half a revolution of shaft 265 will move injection head to the precise point desiredwithin thestator secured within housing 259 (Figure 1) but cannot-move axially or sideways. Therefore, the abovefmentioned movements of rack 279 will cause teeth 282 ofrack 279 to rotate gear 283 in a counterclockwise direction. Gears 284 and 285 also secured to shaft 281 will also rotate in a counterclockwise direction, thereby 'nioving' racks 286 and 287 to the left, as viewed in Figure 20. Rack left, as: viewed in Figure 20,

286 has a projection 288 at'its leftend and rack has a corresponding projection 289 whose purpose will beeXpl-ained below. At the moment that racks 286 and 287- move to the left, injection head 2 has been moved to 'a position directly in front of them so that projections 288 and 289 are directly in line with openings 250 in caps-247 and 248 (Figure 19).' By this time injection head 28 has ceased to move because'of' dwell "291 on cam 27-1. Thus, as racks 286 and 287 continue to move,

through openings in caps 247 and 248.

v projections 288and 289will enter injection head 20 Referring 'now to Figure 1, it will be seen that a base 291d is provided on which a pair of guide blocks 292 and 293 are mounted bl'ock 292. being immovably se- Rack 286'moves'back and forth within block 293. y I

Mounted in block 292 are guide rods 296; openings (not shown) are provided in block 293 to accommodate guide rods 296, and block 293 may thereby be caused to slide along rods 296. Secured to block 292 is a half ring member 29'7 having a solid back 2 98and a cut away portion 299. 'Arsimilar'half ring member 390 (Figures 15, 16 17 and 18) having a solid back 301 and a'cut away portion 302 is secured to guide block 293. The

stator to be wound fits within cut away portions 299 and 302 and is thus supported by the two half rings 297 and 369. Since block 293'is slidableon guide rods 296 half ring 399 may be adjusted with respect tohalf ring 297 to the proper distance to accommodate any width stator.

Still referring to Figure 1, there will be noticed spring housing members 3ll3 and 394. These housings contain long coil springs 385 and 308 respectively (shown inipa'r't in Figure 20). The spring 305 within housing 303-b'ears at one end'against end 396 (Figure'-20) of rack 272, and

at its other 'end'again'st endY306 of the housingQ The pressure of the spring on rack'27-2 may be adjusted by screw 307. The spring'3ti8 within housing 304 is mounted in a similar manner, abutting against end 397 (Figure 20,) of rack 279 at one end and against end 3(l9 o f'housing 304 at the other er d,'the tensionofthe spring being adjustable by means pfscrew 310. These springs serve to make 'the foilowers on tasks 272 and 279 follow cams 271 and m pe tiv lr. e eb se s n ai q ipi e 20 to moveinto place withi'nthe stator to be woundand forcing racks 236 and'287 forwarjd'to causethe coils to be" placed within the stator slots. Thus, the springs e wt hese' r r fl a libe o serve hats a motor-2 1, by causing earns '270 and -27'1topushthefollowers outwardly, effectuates the reverseoperations.

1 Referring :now to Figure '15 (also Figures 16, 17 and 18), there is shown a motor stator member 311 secured within' half rings297 and 391). It will be.seei 1 thathalf ring 300is secured to guide block 293 by means of screws 312 and dowel pins 313 to secure :anaccurate position of half ring 3 00fwith respect to guide block 293; r The same arrangements (not shown) maybe provided- 'for half ring 297 and guide block 292. It is within slots.

insl0t s 231 314 of stator 311 that formed coils 233, held of injection head 21 are to be inserted. V

In Figure 15, pusher shoe 239 is shown in the position to which coils 233 forced it when they were inserted into injection head 20 (Figure 13). Projection 288 of rack 286 is in position to strike pusher shoe 239. T Secured to projection 288 by a pin 315 is a hook 316 whose function will be explained below. It willbe noted that the front 317 of projection 288 is curved to fit the back of pusher shoe 239. Projection 289 has the same shape for the same purpose. i j

Referring now -to Figure 16 of the drawings, it will be seen that the entrance'318 to cut away portion 299 and entrance 31910 cut away portion 302 are curved to permit easyentry of stator 311 into the cutaway sections of half rings 297 and 300. Stator 311 is secured in the half rings as shown. It will also be seen that insulation 320 has been inserted in slots 314 previous to the Wind ing operation. The positionofho'ok 316 on projection 288 is such that, as projection 288 enters throughj openi ing 250 in cap 248,'hook 316 'will j'ust clear the back 321 of pusher shoe 238. Hook 316 is biased to this position by a small spring322 contained in projection 28.8.

A cam surface 323 leads to a ridge 324 in groove '252 i of cap 247. The purpose of ridge 324 and cam surface 323 will be explained hereafterL A baffie plate 325 is. secured as at 326 to the front of guide block 292. Baffle plate 325 is provided to press down the end turns of any previously inserted coilstoprevent injury to the end turns from pusher shoes 238 and 239.

in injection head 20 in order to accommodate blades 255 of pusher'shoes 238 and 239. Thus,'a starting point for blades 255 in slots 231 is provided without immediate interference from coils 233.

Referring now to Figure 17, movement of projection 288has forced 'pushershoe 239 forward to the exte nt shown. Blades '255 of pusher'shoe-239j which have been resting in backs 327 of slots 231, have beenbrought forward with the pusher shoe, and have forced coils 233, V

shoe 238.

ReferringnowtoFigure 18,;it'will be seen that surfaces 254 of raised portions 253 of shoes 238 and 239 arev forcing end turus329 of coils 233 well back toward the outer edge of" stator .311; Cam surface 323 has forced hook 316 to pivot inwardly about pin 315 against the action of spring322. Hook 316 is so proportionedthat as is moves in it latches over back 321 ofshoe 238 into a;recess 33.0 whichisprovided at each end of pin 239 protruding out of injection head 24). Once hooks 316 reach cams surf-aces 323 and move out, thereby disengaging racks 286 and 287 from shoes 238 and 239 ,the shoes have been pulled sufficiently far back into injection head 20 so thatthey will hot protrude. out of injection head 20 and interfere with its subsequent motionaway from stator 311. By viewing Figures 17 and 18 it will be seen that the preformed coils 233have been inserted into-the slots of stator 311 and that this has been achieved in a e be seen that formed 7 coil 233 does not extend all the way back in slots"231"* However as" shown in Figure 19, the sides of slots 231'extend alltheway back 

